Chairs and seats – Rest for knee – leg – or foot – Connected to chair or seat for relative movement
Patent
1982-07-22
1985-05-07
McCall, James T.
Chairs and seats
Rest for knee, leg, or foot
Connected to chair or seat for relative movement
297 68, 297DIG7, A47C 750, A47C 102
Patent
active
045154074
ABSTRACT:
A novel friction latch connected with a chair's footrest mechanism, the footrest mechanism operating to open and close the chair's footrest. The friction latch cooperates with the footrest mechanism to hold the footrest in any desired location between the full extend and full retract positions. The friction latch, in preferred form, includes a torsion spring concentrically and coaxially positioned with a drum that is connected to the footrest mechanism. In the extend mode, the torsion spring is released from a tight friction fit with the drum so the footrest can be opened by a spring motor that extends the footrest assembly. In the latch mode, the torsion spring grips the drum in sufficiently tight friction fit to prevent the footrest from moving when no force is exerted on it, as well as from being retracted in response to the leg weight of the chair's occupant when that occupant is seated comfortably in the chair with his feet on the footrest. In the retract mode, the torsion spring and drum may be the same as in the latch mode, but when an occupant is in the chair the footrest can be closed in response to drawing up of the occupant's legs, i.e., the friction fit of the torsion spring and drum can be overcome by the chair's occupant simply using his legs to exert a closing force against the footrest.
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Leggett & Platt Incorporated
McCall James T.
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